diff options
| author | Niklas Cassel <nks@flawful.org> | 2015-02-01 02:08:50 +0100 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2015-02-07 22:55:47 -0800 |
| commit | e1dd8641c8c36ff4aacf24c7e2575770e30afbe5 (patch) | |
| tree | f18a2defea3e8e741b572fe754a22124ea8323f7 /drivers/mtd/mtdcore.c | |
| parent | d164ea32674ec82e80f480769ffcd2144f901380 (diff) | |
mtd: avoid registering reboot notifier twice
Calling mtd_device_parse_register with the same mtd_info
(e.g. registering several partitions on a single device)
would add the same reboot notifier twice, causing an
infinte loop in notifier_chain_register during boot up.
Signed-off-by: Niklas Cassel <nks@flawful.org>
[Brian: add FIXME comments]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd/mtdcore.c')
| -rw-r--r-- | drivers/mtd/mtdcore.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index cbc0fc46d2d6..52eea932c312 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -577,7 +577,15 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types, err = -ENODEV; } - if (mtd->_reboot) { + /* + * FIXME: some drivers unfortunately call this function more than once. + * So we have to check if we've already assigned the reboot notifier. + * + * Generally, we can make multiple calls work for most cases, but it + * does cause problems with parse_mtd_partitions() above (e.g., + * cmdlineparts will register partitions more than once). + */ + if (mtd->_reboot && !mtd->reboot_notifier.notifier_call) { mtd->reboot_notifier.notifier_call = mtd_reboot_notifier; register_reboot_notifier(&mtd->reboot_notifier); } |